Arson investigators were called to look into a fire on a boat docked at Harbor Island early Sunday, according to the San Diego Fire Department.
Crews received a call of a fire on a vessel at about 5 a.m., according to Lt. Victor Banuelos. Upon arrival, first responders found smoke coming from a 50-foot powerboat.
Firefighters were able to extinguish the blaze and a good Samaritan who was injured while trying to battle the blaze before crews arrived was hospitalized.
Arson investigators were called to the scene but no conclusions have been made on whether the fire was intentionally set. As of Monday, the cause of the fire was undetermined.
The investigation is ongoing.
Editor's Note: A previous version of this story said SDFD was investigating a possible arson. The article has been updated to reflect the cause was undetermined.